Table 33 AC PSU status indicator codes (continued)
Power indicator codes Condition
Blinking green When the firmware of the PSU is being updated, the PSU
handle blinks green.
CAUTION Do not disconnect the power cable, or unplug the
PSU when updating firmware. If a firmware update is
interrupted, the PSUs do not function.
Blinking green and turns off When hot-plugging a PSU, the PSU handle blinks green five
times at a rate of 4 Hz and turns off. This indicates a PSU
mismatch regarding efficiency, feature set, health status, or
supported voltage.
CAUTION If two PSUs are installed, both the PSUs must
have the same type of label; for example, the Extended
Power Performance (EPP) label. Mixing PSUs from previous
generations of systems based on PowerEdge servers is not
supported, even if the PSUs have the same power rating.
This results in a PSU mismatch condition, or failure to turn
on the system.
CAUTION When correcting a PSU mismatch, replace only
the PSU with the blinking indicator. Swapping the PSU to
make a matched pair can result in an error condition and
unexpected system shutdown. To change from a high
output configuration to a low output configuration or
conversely, you must turn off the system. AC PSUs support
both 240 V and 120 V input voltages except for Titanium
PSUs, which support only 240 V. When two identical PSUs
receive different input voltages, they can output different
wattages and trigger a mismatch.
CAUTION If two PSUs are used, they must be of the same
type and have the same maximum output power.
System diagnostics and indicator codes
38 R740xd Owner's Guide
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